Performance Evaluation of a Hybrid Sensor and Vehicular Network to Improve Road Safety

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1 7th ACM PE-WASUN 2010 Performance Evaluation of a Hybrid Sensor and Vehicular Network to Improve Road Safety Carolina Tripp Barba, Karen Ornelas, Mónica Aguilar Igartua Telematic Engineering Dept. Polytechnic University of Catalonia Barcelona, Spain Bodrum, Turkey October 2010

2 Outline 2/26 I. Introduction II. Related work III. Basics of a HSVN (Hybrid Sensor and Vehicular Network) framework Mobility models in VANETs (Vehicular Ad hoc Network) Proposal of a communication protocol between WSNs (Wireless Sensor Networks) and VANETs IV. Simulation results V. Conclusions and future work

3 Outline 3/26 I. Introduction II. Related work III. Basics of a HSVN (Hybrid Sensor and Vehicular Network) framework Mobility models in VANETs (Vehicular Ad hoc Network) Proposal of a communication protocol between WSNs (Wireless Sensor Networks) and VANETs IV. Simulation results V. Conclusions and future work

4 Introduction 4/26 Research on short range wireless technologies has been evolving very fast in the last years. In addition, ad hoc networks are receiving much attention due to the easy deployment they require. In the framework under consideration, there are two kind of ad hoc networks: WSNs (Wireless Sensor Networks) and VANETs (Vehicular Ad hoc Networks). HSVNs (Hybrid Sensor and Vehicular Networks) are introduced as a new concept of road sensor deployment, and they can be seen as a new kind of next generation network architecture.

5 Outline 5/26 I. Introduction II. Related work III. Basics of a HSVN (Hybrid Sensor and Vehicular Network) framework Mobility models in VANETs (Vehicular Ad hoc Network) Proposal of a communication protocol between WSNs (Wireless Sensor Networks) and VANETs IV. Simulation results V. Conclusions and future work

6 Related work (I) 6/26 Recently, different consortiums have been created in Europe, EEUU, Japan... which aim to make safer vehicles and roads. The CAR 2 CAR communication consortium is a non-profit industrial driven organization initiated by European vehicle manufacturers supported by equipment suppliers, research organizations and other partners. CARLINK seeks to develop intelligent service platforms for vehicles. INFOTRANSIT has been developed by the RACC (Reial Automòbil Club de Catalunya) Spanish foundation which provides data to make a safer road.

7 Related work (II) 7/26 Regarding HSVNs, several research studies have been made whose principal challenge is the architecture design. HSVNs need to include a reliable communication protocol between VANETs and WSNs, which have to interchange data from their respective nodes. One of the most important features is that there is no limit in the batteries lifetime of the road side devices or in the storage size as well, since nodes are vehicles. Also, other related work present the benefit of using multiple access technologies and multiple radios in a collaborative manner, to create an advanced heterogeneous vehicular network (AHVN) architecture.

8 Outline 8/26 I. Introduction II. Related work III. Basics of a HSVN (Hybrid Sensor and Vehicular Network) framework Mobility models in VANETs (Vehicular Ad hoc Network) Proposal of a communication protocol between WSNs (Wireless Sensor Networks) and VANETs IV. Simulation results V. Conclusions and future work

9 Basics of a HSVN framework 9/26 The main feature offered by vehicular networks is the capability to distribute traffic road information among the vehicles of a road. In VANETs, it is typically assumed that each node in the network is equipped with some navigation system and also with a GPS. A simple, fast and efficient communication protocol has to be designed to allow communication between VANETs and WSNs. The data interchange has to be very fast, since the interval in which the vehicle is under the transmission range of the WSNs is very short. The cooperation between WSNs and VANETs makes it possible to extend the transmission range in a VANET to a larger region with the cooperation of both networks.

10 Outline 10/26 I. Introduction II. Related work III. Basics of a HSVN (Hybrid Sensor and Vehicular Network) framework Mobility models in VANETs (Vehicular Ad hoc Network) Proposal of a communication protocol between WSNs (Wireless Sensor Networks) and VANETs IV. Simulation results V. Conclusions and future work

11 Mobility models in VANETs 11/26 In a vehicular scenario, cars do not move freely throughout the whole area. They follow streets and roads They are aware of the other vehicles They follow road segments and signals lights In order to achieve realistic results, all these features have to be taken into account when designing a HSVN framework. A mobility model describes the movement pattern followed by the nodes in a specific scenario. Choosing proper simulation settings and mobility model is crucial to obtain accurate results. For instance, in an urban scenario it is important to include obstacles, roads, traffic lights and signals.

12 Outline 12/26 I. Introduction II. Related work III. Basics of a HSVN (Hybrid Sensor and Vehicular Network) framework Mobility models in VANETs (Vehicular Ad hoc Network) Proposal of a communication protocol between WSNs (Wireless Sensor Networks) and VANETs IV. Simulation results V. Conclusions and future work

13 Proposal of a communication protocol between WSNs and VANETs 13/26

14 Outline 14/26 I. Introduction II. Related work III. Basics of a HSVN (Hybrid Sensor and Vehicular Network) framework Mobility models in VANETs (Vehicular Ad hoc Network) Proposal of a communication protocol between WSNs (Wireless Sensor Networks) and VANETs IV. Simulation results V. Conclusions and future work

15 Scenario 15/26 To analyse the performance of the proposed communication protocol between WSNs and VANETs, we have carried out several simulations of data transmissions between different nodes in a HSVN, using the freeware simulator NCTuns6.0 (National Chiao Tung University Network Simulator). 210m 130m 130m 130m 200m d 1 =410 R s R c WSN sink 400m t end 600m

16 Simulation settings 16/26 Setting Average speed of the nodes Number of road lanes Road length Value µ=40 to 120 km/h 4 (two in each direction) 2 Km Number of Mobile nodes in the VANET 4 vehicles Number of nodes in the WSN Transmission Range of the nodes (WSN and VANET) Routing protocol in the HSVN Packet size Time of simulation Data source rate (CBR) 1 sink node R s =R c =200m AODV, DSR 500, 1000, 1500 bytes t end =80 sec. 1 Mbps MAC IEEE b Nominal capacity 11 Mbps

17 Packet losses evolution for AODV 17/ % packet losses bytes 1000 bytes 1500 bytes Car speed (km/h)

18 Packet losses evolution for DSR 18/ % packet losses bytes 1000 bytes 1500 bytes Car speed (km/h)

19 Throughput with AODV and DSR 19/ Throughput (KB/s) AODV 500 B AODV 1000 B AODV 1500 B DSR 500 B DSR 1000 B DSR 1500 B Car speed (km/h)

20 End-to-end packet delay for AODV 20/ delay (s) bytes 1000 bytes 1500 bytes Car Speed (km/h)

21 End-to-end packet delay for DSR 21/ delay (s) bytes 1000 bytes 1500 bytes Car Speed (km/h)

22 Conclusions from the simulations 22/26 In this slide we highlight important conclusions in the performance evaluation of DSR and AODV obtained in the simulations of this particular scenario. After link breakages we can see this behaviour, specially at high speeds: DSR takes longer to find a new path and eventually, it finds the 1-hop path Lower losses. Lower delays. AODV finds sooner a new path, although a longer one Higher losses (multihop) Higher delays WSN sink

23 Outline 23/26 I. Introduction II. Related work III. Basics of a HSVN (Hybrid Sensor and Vehicular Network) framework Mobility models in VANETs (Vehicular Ad hoc Network) Proposal of a communication protocol between WSNs (Wireless Sensor Networks) and VANETs IV. Simulation results V. Conclusions and future work

24 Conclusions and future work 24/26 In this article we have shown the performance of the routing protocols AODV and DSR in a HSVN framework that includes a proposal for a communication protocol between WSNs and VANETs. Simulation results for the scenario under evaluation, show the effectiveness of DSR compared to AODV regarding end-to-end delays, losses and throughput. An immediate work we will analyse the performance of the system under other routing protocols more specific for VANETs, e.g. GSR (Geographic Source Routing), SAR (Spatial Aware Routing) and VADD (Vehicular Assisted Data Delivery). Other aspects will be tackled to improve the routing in HSVN, such as considering the different type of traffics (e.g. warnings, road messages) and Infotaintment services (video-streaming, Internet browsing).

25 Conclusions and future work 25/26 In future work we will modify the routing protocol to include some additional features for vehicular networks, such as location and speed of the vehicles. In addition, we will evaluate the system performance using the MAC IEEE p specification, which is focused on VANETs. Also, we plan to develop an analytical model so that nodes can estimate the medium occupancy. We will include this model in the routing protocol to choose the best path.

26 26/26 7th ACM PE-WASUN 2010 Performance Evaluation of a Hybrid Sensor and Vehicular Network to Improve Road Safety Carolina Tripp Barba, Karen Ornelas, Mónica Aguilar Igartua Telematic Engineering Dept. Polytechnic University of Catalonia Barcelona, Spain Thank you very much for your attention Bodrum, Turkey October 2010

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